You may be able to find the update in the Software Update Control Panel in OS 9. You can also download the update directly from Apple, but you will be required to login with an AppleCare account. If you have trouble accessing that URL, go to Appleis Web site, click on "Support" in the navigation menu, click on "Downloads" in the sidebar of the Support page, and then look for the CarbonLib link in the list of updates on that page.